Fan



8- 1933. E. L. ANDERSON 1,920,543

Filed Jan. 2. 1931 SSheats-Sheet 1 v R a IIII'IIIII lg. I.

/ I INVENTOR A TTOR/VEYS Aug. 1, 1933. E. L. ANDERSON FAN 3 Sheets-Sheet 2 Filed Jan. 2, 1931 INYENTOR MK ATTORNEY 6' Patented Aug. 1, 1933 UNITED STATES PATENT OFFICE FAN ApplicationJanuary 2, 1931.. Serial No. 506,059

9 Claims.

My invention relates to fans.

It is the object of my invention to provide a fan of airfoil section of uniform design in section and tapering from hub to tip.

It is a further object to'provide a means of mounting an airfoil section fan consisting of a shell of relatively thin material on a hub, and to provide a hub of maximum strength and maximum lightness upon which the blade shells can be mounted and demounted with ease.

It is a further object to provide a motor support frame and fan encircling ring interdependent and so arranged that the supports are streamline in section while still being capable of being mounted rigidly on the motor and plate.

It is a further object to provide a square frame which will fit in an opening such as a portion of a window opening or a door opening, and in combination therewith, a fan ring having a Venturi 20 throat.

In particular, it is my object to provide a fan blade of airfoil section without a longitudinal,

helical twist.

Referring to the drawings, Figure 1 is a front elevation of a portion of the fan blades, motor support, ring and frame.

Figure 2 is a section on the line 2--2 thereof.

Figure 3 is a detail edge elevation of one of the blades.

Figure 4 is a detail side elevation.

Figure 5 is a detail elevation of the blade, hub and ring showing the mounting of the blade and its position on the hub.

Figure 6 is a front elevation of a portion of the hub with the motor removed and of a pair of blades broken away to show the stub supports for the blades.

Figure '7 is a section on the line 7-7 of Figure 6.

Figure 8 is a detail section through the hub.

Figure 9 is a section on the line 99 of Figure 6 through a portion of the hub showing its rib reenforcement.

Referring to the drawings hereinbefore described, I provide a ring plate or frame 1 which is provided with a ring 2 that is rectangular. This ring is provided with a corner bracket 3, on the face of which is formed an outwardly and downwardly extending tapered lug 4 for receiving the thin shell 5, which is streamline in section and constitutes a motor support. There are four of these supports in the present construction, but their number may be varied. Mounted on the ring plate 1 is a Venturi ring 6 within which the fan blades 7 rotate. These blades are mounted to the radius lines of the hub rurming through upon a hub 8, which is supported by a motor shaft 9 of the motor 10. The motor itself is provided with the saddles 11 having oblique stub arms 12 for receiving the inner ends of the braces 5, the ends of the braces resting as at 13 upon the surface of the saddle and the stub 12 being inserted within the end of the streamline shell 5.

Referring to the fan itself, the hub 8 is provided with a plurality of ribs 14 between the outer rim 15, on which the ends of the blades 7 rest, and with the inner rim 16 which engages the armature shaft 9. The periphery of this hub on the outside of the rim 15 is provided with arcuate sad dles 17 having ribbed stubs 18 extending parallel the ribs 14. Each of these stubs is provided with a rib 19, which has a face for engagi g the inside of one wall of the shell that constitutes the fan blade '7. This rib merges through the arcuate surfaces 20 into side ribs 21 and 22. The back of this stub at 23 engagesthe flat face 24 of the fan blade '7, while the rib 19 engages the inside of the arcuate face 24. The rib 21 engages the inside af the shell of the blade 7 at the leading edge 25, while the rib 22 is spaced from the trailing edge 26-. The leading edge 25 is arranged at right angles to the horizontal axis of the hub and parallel with the face 2'7 of the hub, while the trailing edge 26 is disposed parallel to the plane of the rear face of the hub at 28. Viewed in elevation, the hub and of the trailing edge overlaps the vertical plane of the face of the inside of the ring 6. It inclines progressively upwardly and outwardly in the direction of the air stream, ter- 90 minating in an arcuate end 29, just within the Venturi ring 6. This apparent inclination of the trailing edge is due to the fact that while the straight face 2'7 is vertically disposed at right angles with respect to the axis of the fan, the 95 arcuate face 24' is tilted with respect thereto; so that the fan blade starts out with a relatively broad base, as will be seen in Figure 3, and terminates at a relatively narrow line at the top. The trailing edge and the leading edge are, how- 1 ever, parallel to one another, as will be seen in Figure 4 as well as in Figure 6.

I desire to comprehend within my invention such modifications as may be clearly embraced within my claims and the scope of my invention.

Having thus fully described my invention, what I claim is new and desire to secure by Letters Patent, is: r

1. In combination in a fan, sheet-metal blades of relatively thin material having inner semino circular ends, a hub for supporting said inner ends, arcuate saddles mounted on said hub extending telescopically within said hollow blades and stubs on said saddles engaging a portion of ends, arcuate saddles mounted on said hub extending telescopically within said hollow blades and angular stubs on said saddles engaging a portion of the interior of the blades, said stubs engaging the interior of the leading edge of the blade, the inlet side of the blade and the outlet side of the blade.

3. In combination, a hub comprising a hollow drum, saddles mounted on the exterior of said drum, stubs projecting from said saddles with their longitudinal axes eccentrically arranged but parallel to radial lines through said hub, and hollow blades mounted on said saddles and stubs and resting upon the periphery of the hub drum.

4. In combination, a hollow drum-like hub, a plurality of saddles mounted on the exterior thereof having stub projections for engaging and supporting fan blades, and hollow fan blades mounted thereon and resting upon said hub drum, ribs on said stubs, said stubs being arranged to engage the interior of the leading edge of the blade and to span the interior of the blade from side to side.

5. In combination, a hub, blades of airfoil section of relatively thin sheet material and having substantially parallel edges and solid stub supports mounted on said hub conforming to the configuration of the blade section, each having an angular extension extending within the blade and engaging a portion thereof.

6. In combination, a hub, a plurality of blades of airfoil section, one face of which is a plane, and a Venturi ring arranged encircling said blades, one edge of said ring being substantially in line with one edge of each blade, and a plate for supporting said ring of angular outline.

7. In combination, a hub, a plurality of blades of airfoil section, one face of which is a plane, and a Venturi ring arranged encircling said blades, one edge of said ring being substantially in line with one edge of each blade, 2. plate for supporting said ring of angular outline, a motor for operating said fan, supporting struts for said motor connected to said plate.

8. In combination, a hub, a plurality of blades of airfoil section, one face of which is a plane, a Venturi ring arranged encircling said blades, one edge of said ring being substantially in line with one edge of each blade, a plate for supporting said ring of angular outline, a motor for operating said fan, supporting struts for said motor connected to said plate, and corner ears in the corners of said plates for supporting said struts.

9. In combination, a motor, a fan driven thereby, a Venturi ring, a ring plate supporting said Venturi ring, shouldered projections on said plate, saddle and stub projections on said motor, and hollow struts mounted on said stub and shouldered projections at spaced intervals to support the motor and fan within the Venturi ring, and fan blades on said fan of airfoil section, one face of each of said blades being a plane, and a streamlined housing for said motor and a streamlined section for said struts where- 'by said airfoil sections operate with a minimum of air disturbance. EDWARD L. ANDERSON. 

